The scientific research underpinning this SNIC SMALL proposal strives to make significant advances in the theoretical description of atomic nuclei. This project is funded by VR project grant (dnr. 2020-05127). In particular, we will use HPC computation to study the prospects of describing atomic nuclei using effective field theories of QCD. Several aspects of this research will require HPC efforts: 1) exploring power-counting schemes in EFT 2) constraining the three-nucleon interaction in chiral EFT using three-nucleon scattering observables 3) computational statistics analyses of strongly interacting systems. All efforts will play a crucial role for predicting the properties of exotic isotopes, strongly interacting matter, neutron star properties.
All employed codes are developed in-house, are well tested, and mainly exploit standard numerical LAPACK routines for optimal parallel (OpenMP-MPI) performance.
The computational challenge encompass:
- efficient fast computation of three-nucleon scattering observables [repeated matrix-vector products and matrix diagonalizations on multiple nodes simultaneously, hybrid OpenMP and MPI codes].
- evaluation of quantum mechanical models for performing many-parameter optimization and inference of coupling constants in nuclear EFT [threaded evaluation of complex likelihoods, parallel evaluation using emulators]
- large-scale matrix diagonalization (to solve the quantum mechanical many-body problem with strong interactions). Sparse MatVec and large VecVec operations.
Our collaboration, that includes researchers in Scandinavia and the US, are currently pioneering such computational nuclear physics efforts.